Allison 1000 6-Speed Automatic, 4WD, Black Leather.Recent Arrival!Onyx Black 2018 GMC Sierra 2500HD SLT Allison 1000 6-Speed Automatic Duramax 6.6L V8 Turbodiesel*** WE COMPETE WITH ALL MAJOR BANKS AND CREDIT UNIONS *** Fully Serviced and NC State Inspected. *** NO SURPISES OR DISAPPOINTMENTS *** Priced VERY COMPETITIVELY with the market; we use INDEPENDENT THIRD PARTY ANALYSIS to examine current market pricing and continually adjust OUR prices to position our pre-owned vehicles as the BEST VALUE for YOU, OUR CUSTOMER. Visit us 24/7 at www.brandonreevesautoworld.com. *** Call Now (877) 721-7843 *** Every effort is made to insure the accuracy of the information in this listing. Horsepower calculations based on trim engine configuration. Fuel economy calculations based on original manufacturer data for trim engine configuration. Please confirm the accuracy of the included equipment by calling us prior to purchase.